Climate change was a major part of my degree and it baffles me that people can think we’re nothing to do with it. But it is complicated and when I think about it if you’ve not seen all the graphs, data and read the reports I can see why you may be a little reluctant to accept that we are a major factor.
Yes, the global temperature does go up and down on a cycle. But the temperatures now are higher than they have been in the last 10,000 years. (2009 is the cross in the top right of this graph).
This graph shows very neatly how it is our fault. There is a very clear link between CO2 and global temperature and the increase in atmospheric CO2 since 1855 and the slightly offset increase in temperature is clear. All the research points to the rise in CO2 being the cause of the rise in temperature.
Here’s a graph showing the historic link between CO2 and temperature.
It’s difficult to explain without getting into some fairly serious science and bamboozling people. But the evidence points to it, almost all scientific papers on it say that it exists and once you read some of these it becomes very difficult to deny.
The big scare for the future in terms of climate change is really what we’re doing to the ocean. The amount of CO2 we are producing is increasing the acidity of the oceans- the oceans draw down a large amount of the CO2 we pump out, limiting the global temperature rise. Unfortunately this increases their acidity which impacts on calcareous life (corals etc) in the ocean. They are a major cause of the oceans drawing down CO2 and without them what would go into the oceans will go into the atmosphere. Then we’re really stuffed.